Quote:
Originally Posted by GR8_ASP
The delta T across the engine seems high (should be more like 15 F). When are you measuring the hose temps? At idle, while driving or immediately following driving? Is the fan on when you are checking it?
A high delta T across the engine can be caused by low coolant flow rates. So either a pump issue, a restriction (like a stuck thermostat or kinked hose) or something of that nature may be occuring. It can also be caused by excessive heat rejection to the coolant. If your engine is running ok I am doubtful as to that. However, compression leakage to the coolant is a low probability cause (head gasket, erosion of head water jacket, etc).
My guess is on the flow side if the heater performance is poor. Have you checked the aftermarket thermostat operation? That would be my first guess.
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More good information. Fan is working fine. Runs at both low and high speeds. I'll remove the t-stat and test it in boiling watter. I'll also look for obstructions. Maybe run watter from a garden hose thru the engine. I'll also do a compression test to all cylinders. I don't see any unusual compression or vacume in the coolent system. I am running a new radiator cap. 17PSI I still have the ole 195 degree t-stat. Should I put that back in for testing?